Fuse



a 2%; 6 mm 13 w. u A J m June 22 1926.

' having long cylindrical flange 11.

Patented June 22, 1926 UNITED STATES PATENT OFFICE.

JAMES LESLIE LANE OF CHICAGO, ILLINOIS, ASSIGNOR TO CHICAGO FUSE MFG. COM- PANY, OF CHICAGO, ILLINOIS,

A CORPORATION OF ILLINOIS.

FUSE.

Application filed May 19,

My invention relates to improvements in electrical fuses, and has for its main object the provision of a fuse adapted for small currents, such as are utilized in radio receiving sets.

Another object is to provide a fuse which is simple and artistic in construction, and which is provided with a transparent enclosing member such that a blow can be easily detected by casual inspection, thereby adapting the fuse to the protection of radio electron tubes and other delicate electrical devices.

A further object is to provide a fuse unit comprising a removable cartridge fuse, and a novel mounting having a special clip adapted to support the cartridge and retain it in good electrical contact.

Further objects and advantages will be come apparent as the description proceeds.

In the drawings, Figure 1 is a vertical section of a cartridge fuse embodying the features of my invention.

Fig. 2 is a side view in elevation of the cartridge fuse and its mounting.

Fig. 3 is a plan view of the mounting.

In the exemplary embodiment illustrated in thedrawings, represents a metallic head preferably constructed of brass and A sleeve 12 is formed integral with the head 10, and extends concentrically through the flange 11. Extending through the sleeve 12 is an insulating bushing 13 made of any su table material. and having a peripheral flange 14- on its lower end abutting against the face of the head 10. A contact screw 15 having a head 16 fitting against the flange H is threaded completely through the sulating bushing 13. A fuse element 1 electrically connected at its opposite ends to the sleeve 12 and the upper end of the screw 15. The head 10 and the head 16 thus constitute the two contacts of the cartridge fuse. To enclose and protect the fuse element 17, a transparent tube or globe 18 closed at its upper end is removably mounted in the flange 11 in telescoping relation. It will be seen that the construction thus far described is simple and inexpensive, and that the fuse element 17 can be easily and quickly replaced or renewed, and is wholly exposed to view. This last feature is advantageous where small currents are employed and the blow is light and unnotice- 1924. Serial No. 714,217.

able, since the condition of the fuse element 1.7 can be observed by a casual glance.

To support the fuse cartridge, the head 1.0 is adapted to be forced into yielding engagernent with a pair of spaced spring arms 19 formed on a. clip 20. This clip constitutes one contact of the fuse mounting, and is provided with a metallic strip 21 which is secured to a base board 22 by a screw 23, and is adapted to be connected with an electric lead wire (not shown) in any well known manner. Underlying the arms 19 is a contact 24. mounted on the free end of a spring leaf 25 to engage the head 16 when the cartridge is clamped in place. The leaf 25 is secured to the board 22 by a screw 26, and is also adapted to be connected with a lead wire not shown). To prevent the head 16 from moving vertically out of engagement with the contact 2%, the arms 19 are formed with a plurality of lugs 27 bent inwardly to fit over the upper edge of the sleeve 11. While I have described the preferred embodiment of my invention with considerable particularity for purposes of illustration, it is to be understood that I do not thereby intend to limit the same but aim in the sul joined claims to cover all modifications and alternative constructions falling within its spirit and scope.

I claim as my invention:

1. A fuse comprising, in combination, a metallic head l'iaving a cylindrical flange and an integral sleeve extending conceir trically into said flange, said head constituting one contact of the fuse, an insulating bushing extending through said sleeve and having a peripheral flange on one end fitting againstthe face of said head, a contact screw threaded through said sleeve and having a head fitting against said peripheral flange and constituting the other Contact of the fuse. a fuse element connected to the inner end of said screw and to said cylindrical flange, and a glass tube closed at its outer end and fitting over said fuse element into telescoping relation with said cylindrical flange.

2. A fuse comprisin in combination. a cylindrical head having a concentric sleeve constituting one contact of the fuse, an insulating bushing in said sleeve, a contact member extending through said sleeve and having a head on one end constituting the 

